The integration of new optoelectronic devices into practical systems has been impeded by the fact that researchers have been unable to evaluate how these devices can be used to make components, and then how these components can be used to build systems. We address this need with an Opto-Electronic system prototyping tool based on Ptolemy. Introduction Free-Space Opto-Electronic (FSOE) Systems will become key components of the next generation of computers and communications networks. Prototypes of these systems have been proposed, designed and constructed for the last 20 years. However, these systems have only existed in university and industry laboratories. To date, they have not seen general use. One of the reasons for this phenomena is that the time and effort involved in designing and building these systems, even as prototypes, is prohibitively expensive. Aside from some work in the area of CAD for fiber networks [4][1][10] these designs are currently performed essentially by hand....

We report a proof-of-principle experiment on distant clock synchronization. Besides the achievement of picosecond resolution at 3 kilometer distance, this experiment demonstrated a novel concept for high accuracy non-local timing and positioning based on the quantum feature of entangled states. Accurate timing and positioning metrological measurements are important for both fundamental research and practical applications. In particular, distant clock synchronization has attracted a great deal of attention in recent years due to its essential role in the Global Positioning System (GPS) and telecommunications [1]. Modern clocks have been improved to such a level [2], that the resolution and accuracy of the comparison techniques have become the limiting factors to determine their relative rates and synchronization. There are two standard methods for synchronizing two distant clocks: the classic Einstein protocol [3] and the Eddington slow transportation method [4]. Both methods have certain limitations and difficulties in high accuracy nonlocal synchronization in which relativistic effects, such as the rotating disk problem, have to be taken into consideration.

...................................................................................................................................... viii List of publications .......................................................................................................................ix Chapter 1: Introduction..................................................................................................................1 1.1 Scope and overall research contribution..............................................................................1 1.2 Motivation............................................................................................................................2 1.2.1 The interconnect problem .............................................................................................2 1.2.2 Capabilities and limitations of electrical interconnects................................................4 1.2.3 Advantages of optical interconnects ......................................

The performance of parallel computer systems is increasingly limited by constraints imposed by interconnects and this limitation will inevitably become more serious as capability of each processing node increases. Optics has already proved its worth in telecommunications and more recently in interconnecting computers and computer peripherals. In this paper, we propose an optical hybrid tree network which is essentially a cluster of optical binary trees interconnected with a fat tree near the root. Binary trees have favorable features such as constant node degree, small node degree, scalability, etc, however, in a conventional binary tree, the traffic towards the root of the tree is very heavy and hence a fat-tree structure in which branches get thicker towards the root has been employed in computers such as the CM-5 from Thinking Machines. Use of optical channels results in increased bandwidth per channel and we suggest that the high bandwidth of optical interconnects and channels enab...

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We have created a technology-enhanced learning environment (TELE) for a graduate/undergraduate course on Optical Fiber Communications.

We describe the first iteration of a comprehensive model with which we can investigate the practical limits on optical bus bandwidth and number of bus processing modules for given signal power. The selection algorithm will ultimately allow programmable evaluation of system parameters bus bandwidth, optical power budget, electrical power budget, number of modules and space consumption for an optimal design that is suited to on-the-fly system reconfiguration.

Abstract-In this paper the effect of atmospheric turbulence on free space optical (FSO) communications is investigated experimentally by designing a turbulence simulation chamber. The distributions of bits ‘0 ’ and ‘1 ’ levels are measured with and without turbulence. The bit error rate (BER) is then obtained from the distributions. The temperature gradient within the channel is less than 6 °C resulting in turbulence of log irradiance variance of 0.002. The received average signal is measured and used to characterise the simulated turbulence strength. We then evaluated the BER with turbulence and found that from an error free link in the absence of turbulence, the BER increased significantly to about 10-4 due to the turbulence effect. I.

Abstract--In a fiber-optic system at long distances or high data rates, the system can be limited either by the losses (attenuation-limited transmission) or, assuming that the link is not limited by the source or detector speed, by the dispersion of the fiber (dispersion-limited transmission).In this paper we demonstrate how the optimum link length can be determined in different aspects like Dispersion & attenuation. Key Words: Link Length, attenuation limited transmission, & Dispersion limited transmission.

New research in optoelectronic devices, which have made it practical to use optoelectronics in computing and communications systems, as well as the need for these systems to support higher information capacities has brought about a growing need for design and analysis tools for optoelectronic systems. While there are many research groups developing new and exciting optoelectronic devices, the integration of these devices into practical systems has been slow to follow. The reason for this lag is that researchers who design systems need to be able to evaluate how these new devices can be used to make components, and then how these components can be used to build systems. By having tools for effectively evaluating new designs based on new devices, system designers will be able to evaluate possible designs, and give feedback to materials and devices researchers for improved components.